| /* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors: |

| * |

| * Simon Wunderlich, Marek Lindner |

| * |

| * This program is free software; you can redistribute it and/or |

| * modify it under the terms of version 2 of the GNU General Public |

| * License as published by the Free Software Foundation. |

| * |

| * This program is distributed in the hope that it will be useful, but |

| * WITHOUT ANY WARRANTY; without even the implied warranty of |

| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

| * General Public License for more details. |

| * |

| * You should have received a copy of the GNU General Public License |

| * along with this program; if not, see <http://www.gnu.org/licenses/>. |

| */ |

| |

| #ifndef _NET_BATMAN_ADV_BITARRAY_H_ |

| #define _NET_BATMAN_ADV_BITARRAY_H_ |

| |

| /* Returns 1 if the corresponding bit in the given seq_bits indicates true |

| * and curr_seqno is within range of last_seqno. Otherwise returns 0. |

| */ |

| static inline int batadv_test_bit(const unsigned long *seq_bits, |

| uint32_t last_seqno, uint32_t curr_seqno) |

| { |

| int32_t diff; |

| |

| diff = last_seqno - curr_seqno; |

| if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) |

| return 0; |

| else |

| return test_bit(diff, seq_bits) != 0; |

| } |

| |

| /* turn corresponding bit on, so we can remember that we got the packet */ |

| static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n) |

| { |

| /* if too old, just drop it */ |

| if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) |

| return; |

| |

| set_bit(n, seq_bits); /* turn the position on */ |

| } |

| |

| /* receive and process one packet, returns 1 if received seq_num is considered |

| * new, 0 if old |

| */ |

| int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, |

| int32_t seq_num_diff, int set_mark); |

| |

| #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |